Articulating mechanism for surgical instrument

ABSTRACT

A surgical instrument, such as a surgical fastener applying apparatus, includes a tool assembly, an endoscopic body portion, and an articulation mechanism. The articulation mechanism articulates the tool assembly in relation to the endoscopic body portion over large arc segments while providing simple operating components. Thus, the range of operation of the surgical instrument and the types of surgical activities that can be performed by the surgeon can be expanded without at the same time requiring complex operating components.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of and priority to U.S. Provisional Patent Application No. 62/944,745 filed Dec. 6, 2019, the entire disclosure of which is incorporated by reference herein.

FIELD

The disclosure relates to surgical devices and, more particularly, to surgical devices that can be articulated.

BACKGROUND

Surgical instruments are known in the art which can be articulated at angles up to approximately 45 degrees and even greater angles. However, such instruments may require complex operating mechanisms to achieve articulation.

SUMMARY

The disclosure provides significant and non-obvious advantages over the prior art by enabling articulation over large angles between an endoscopic body portion and a tool assembly such as an anvil and cartridge assembly, thereby enabling significant extension of surgical operating procedural capabilities.

In one aspect, the disclosure relates to a surgical instrument including an endoscopic body portion defining a first longitudinal axis and having a proximal end portion and a distal end portion and a tool assembly defining a second longitudinal axis and having a proximal end portion and a distal end portion. The tool assembly is coupled to the endoscopic body portion at an interface connection. The interface connection includes a first angled surface formed on the distal end portion of the endoscopic body portion and a second angled surface formed on the proximal end portion of the tool assembly. The first and second angled surfaces are positioned in abutting relation.

The surgical instrument also includes an operating mechanism configured to transition the tool assembly from a first position in which the first and second axes are aligned to second articulated positions in which the first and second axes are misaligned, the operating mechanism including a drive member that extends through the endoscopic body portion and is coupled to the tool assembly such that rotation of the drive member causes rotation of the tool assembly in relation to the endoscopic body portion to transition the tool assembly from the first position to the second articulated positions.

In one aspect, the tool assembly includes a clamp member and the drive member is formed from a resilient material that is rigidly connected to the clamp member within the tool assembly such that actuation of the operating mechanism causes the clamp member to rotate the tool assembly around the interface connection of the endoscopic body portion.

In another aspect, the operating mechanism includes a rack and pinion gear assembly in operable communication with the drive member, the rack and pinion gear assembly including a rack and a pinion gear engaged with the rack, the pinion gear coupled to the drive member, wherein linear motion of the rack effects rotational movement of the pinion gear to effect corresponding rotation of the drive member.

In yet another aspect, the pinion gear of the rack and pinion gear assembly defines an aperture, the drive member being longitudinally movable through the aperture to facilitate longitudinal movement of the clamp member in relation to the tool assembly.

In one aspect, the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, the second angled surface defines a second angle at the proximal end portion of the tool assembly, and the sum of the first angle and the second angle forms a third angle that is greater than or equal to 90 degrees.

In another aspect, the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, the second angled surface defines a second angle at the proximal end portion of the tool assembly, and the sum of the first angle and the second angle forms a third angle that is less than 90 degrees.

In yet another aspect, the tool assembly includes an anvil and cartridge assembly, the anvil and cartridge assembly including a cartridge assembly and an anvil, the anvil and cartridge assembly being pivotably movable to effect the transitioning of the tool assembly from the first position to the second articulated positions.

In another aspect, the disclosure relates also to a surgical instrument wherein the tool assembly includes a cartridge assembly and an anvil. The cartridge assembly is pivotably movable in relation to the anvil between spaced and approximated positions.

The surgical instrument also includes an endoscopic body portion. The anvil and cartridge assembly and the endoscopic body portion each define respective longitudinal centerline axes and including proximal and distal end portions. The anvil and cartridge assembly are coupled to the endoscopic body portion at an interface connection. The interface connection includes a first angled surface formed on the distal end portion of the endoscopic body portion and a second angled surface formed on the proximal end portion of the anvil and cartridge assembly. The first and second angled surfaces are positioned in abutting relation.

The surgical instrument also includes an operating mechanism configured to transition the anvil and cartridge assembly from a first position in which the first longitudinal axis defined by the endoscopic body portion and the second longitudinal axis defined by the anvil and cartridge assembly are aligned to second articulated positions in which the first longitudinal axis defined by the endoscopic body portion and the second longitudinal axis defined by the anvil and cartridge assembly are misaligned. The operating mechanism includes a drive member that extends through the endoscopic body portion and is coupled to the anvil and cartridge assembly such that rotation of the drive member causes rotation of the anvil and cartridge assembly in relation to the endoscopic body portion to transition the anvil and cartridge assembly from the first position to the second articulated positions.

In an aspect, the surgical instrument again further includes a clamp member and the drive member is formed from a resilient material that is rigidly connected to the clamp member within the anvil and cartridge assembly such that actuation of the operating mechanism causes the clamp member to rotate the anvil and cartridge assembly around the interface connection of the endoscopic body portion.

In an aspect, again the operating mechanism includes a rack and pinion gear assembly in operable communication with the drive member, the rack and pinion gear assembly including a rack and a pinion gear engaged with the rack, the pinion gear coupled to the drive member, wherein linear motion of the rack effects rotational movement of the pinion gear to effect corresponding rotation of the drive member.

In an aspect, again the pinion gear of the rack and pinion gear assembly defines an aperture, the drive member being longitudinally movable through the aperture to facilitate longitudinal movement of the clamp member in relation to the tool assembly.

In an aspect, again the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, the second angled surface defines a second angle at the proximal end portion of the tool assembly, and the sum of the first angle and the second angle forms a third angle that is greater than or equal to 90 degrees.

In an aspect, again the first angled surface may define a first angle at the distal end portion of the endoscopic body portion, the second angled surface defines a second angle at the proximal end portion of the tool assembly, and the sum of the first angle and the second angle forms a third angle that is less than 90 degrees.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate aspects of the disclosure and, together with the detailed description of the aspects of the disclosure given below, serve to explain the principles of the disclosure:

FIG. 1 illustrates a perspective view of a distal portion of a surgical instrument exemplified by a stapling device according to aspects of the disclosure including an endoscopic body portion and a tool assembly configured for a stapling device and therefore having an anvil assembly and a cartridge assembly or anvil and cartridge assembly with the tool assembly in an open, non-articulated position aligned with the longitudinal axis of the endoscopic body portion;

FIG. 2 is a perspective view of the endoscopic body portion and tool assembly shown in FIG. 1 with the tool assembly in an articulated position at a first angle with respect to the longitudinal axis of the endoscopic body portion;

FIG. 3 is a perspective view of the endoscopic body portion and tool assembly shown in FIG. 2 with the tool assembly in an articulated position at a 90 degree angle with respect to the longitudinal axis of the endoscopic body portion:

FIG. 4 is a perspective view of a portion of the stapling device shown in FIG. 1 with a distal end of the endoscopic body portion separated from a proximal end of the tool assembly;

FIG. 5 is a cross sectional view of an interface connection between the endoscopic body portion and the tool assembly shown in FIG. 1 with the tool assembly in a non-articulated position; and

FIG. 6 is a cross sectional view of the endoscopic body portion and the tool assembly shown in FIG. 1 in the articulated position shown in FIG. 3 .

DETAILED DESCRIPTION

Aspects of the disclosure relate to connection and transfer devices that provide significant and non-obvious advantages in the field of surgical devices by enabling articulation between an endoscopic body portion and a tool assembly over large arc segments with a simple articulation mechanism that does not require longitudinal movement of an articulation link, thereby enabling significant extension of surgical operating procedural capabilities.

Throughout this description, the term “proximal” refers to the portion of the device closest to the operator and the term “distal” refers to the portion of the device furthest from the operator.

The disclosure relates to surgical instruments, for example, a surgical fastener applying apparatus such as disclosed in U.S. Pat. No. 8,292,156 B2 to Kostrzewski. The surgical instrument according to aspects of the disclosure includes a tool assembly, an endoscopic body portion, and an articulation mechanism that articulates the tool assembly in relation to the endoscopic body portion over large arc segments while providing simple operating components. Thus, the range of operation of the surgical instrument and the types of surgical activities that can be performed by the surgeon can be expanded without at the same time requiring complex operating components.

FIGS. 1-6 illustrate a surgical instrument including an articulation mechanism according to aspects of the disclosure. FIG. 1 illustrates a perspective view of a portion of a surgical instrument 100. The surgical instrument 100 has an endoscopic body portion 110 and a tool assembly 108 according to the aspects of the disclosure with the tool assembly 108 in a spaced apart position and extending linearly along a longitudinal axis X1-X2 of the endoscopic body portion 110 of the surgical instrument 100. In aspects of the disclosure, the tool assembly 108 is exemplified by an anvil and cartridge assembly of a surgical fastener applying apparatus or stapling device. Alternately, the tool assembly 108 may be in the form of a variety of other surgical devices including graspers, clip appliers, retractors, ligation devices, dissectors, or the like.

The tool assembly 108 includes a cartridge 1601 that is operably connected to an anvil 1602 and is movable in relation to the anvil 1602 between a spaced apart position (FIG. 1 ) and a clamped or closed position (not shown).

The endoscopic body portion 110 includes a proximal end 110 a (FIG. 1 ) (represented by the break line) and a distal end 110 b while the tool assembly 108 as exemplified by the anvil and cartridge assembly 160 includes a proximal end 160 a and a distal end 160 b. Axis portion X1 of the axis X1-X2 extends from proximal end 110 a of the endoscopic body portion 110 to the distal end 110 b of the endoscopic body portion 110 while axis portion X2 of the axis X1-X2 extends from the distal end 110 b of the endoscopic body portion 110.

The tool assembly 108 defines a longitudinal axis Y1-Y2 wherein axis portion Y1 ranges from an orientation overlapping axis portion X1 to form an angle θ1 between axis portion X1 and axis portion Y1 equal to zero, as in FIG. 1 , to an orientation defining an angle of 90 degrees or more as shown in FIG. 6 with axis X1 as described below.

FIG. 2 is a perspective view of the endoscopic body portion 110 and the tool assembly 108 as shown in FIG. 1 with respect to the longitudinal centerline axis X1-X2 of the endoscopic body portion 110 and illustrating one aspect of an operating mechanism 120 for articulation of the tool assembly 108 with respect to the longitudinal centerline axis X1-X2 of the endoscopic body portion 110. The tool assembly 108 defines a longitudinal centerline axis Y1-Y2. More particularly, the tool assembly 108 now extends at angle θ2 (FIG. 2 ) between axis portion X2 and axis portion Y2. Angle θ1 between axis portion X1 and axis portion Y1 is shown and is an acute angle equal to angle θ2.

The distal end 110 b of the endoscopic body portion 110 and the proximal end 160 a of the tool assembly 108—are configured to interface with one another as further described below.

The operating mechanism 120 includes a rack and pinion gear assembly 122 in operable communication with a drive member 128 wherein linear motion of rack 124 in a direction transverse to the axis X1-X2 effects rotational movement of pinion gear 126 by the intermeshing of rack gear teeth 124′ with gear teeth 126′. The reversible linear motion of the rack 124 as shown by double-sided arrow R rotates the pinion gear 126, as shown by double sided curved arrow G, which is operably connected to the drive member 128 causing thereby the rotation and flexing of the drive member 128.

FIGS. 4-6 illustrate the interconnection of the elongate body 110 and the tool assembly 108. The drive member 128 is operably connected to a clamp member 168 of cartridge assembly 1601 (see FIG. 1 ). Cartridge assembly 1601 includes a longitudinal slot 161 which receives and confines the clamp member 168. The clamp member 168 is confined within the tool assembly 108 as is known in the art.

As the clamp member 168 is rotated by the drive member 128, the cartridge assembly 1601 is forced to rotate around interface connection 130 which is shown and described in more detail below in FIG. 4 . The rotation of the clamp member 168 which is confined within the tool assembly 108 causes rotation of the entire tool assembly 108 around the interface connection 130.

Referring again to FIG. 2 , drive member 128 includes a portion 128′ extending along or parallel to longitudinal centerline axis X1-X2 having a square or rectangular cross-section to define four flat surfaces around the longitudinal centerline axis X1-X2. The portion 128′ of drive member 128 is received in aperture 1260 of gear 126 in a slidable manner to enable the drive member 128 to advance and retract longitudinally in relation to the gear 126 along or parallel to the longitudinal centerline axis X1-X2 in the direction of double-sided arrow A. The advancing and retracting of the drive member 128 enables longitudinal movement of the clamp member 168 within the tool assembly 108 to facilitate actuation of the tool assembly 108, e.g., stapling and cutting of tissue.

FIG. 3 is a perspective view of the tool assembly 108 as shown in FIG. 2 with longitudinal centerline axis Y1-Y2 of the tool assembly 108 extending at a 90 degree angle with respect to the longitudinal axis X1-X2 of the endoscopic body portion 110. In this position, angle θ1 between axis portion X1 and axis portion Y1 is equal to angle θ2, the angle between axis portion X2 and axis portion Y2 and both are equal to 90 degrees in FIG. 3 .

As explained below with respect to FIG. 4 , angle α3 is the angle between the longitudinal centerline axis X1-X2 and the longitudinal centerline axis Y1-Y2 and is equal to the sum of angles α1 and α2 which are further described and defined with respect to FIGS. 4-6 below. Since the angle α3 and the angle θ1 are defined with respect to the axes X1-X2 and Y1-Y2, the sum of angles α3 and θ1 equals 180 degrees.

FIG. 4 is a perspective view of the stapling device 100 wherein the endoscopic body portion 110 and the tool assembly 108 are separated from one another showing the internal structure of the interface connection 130 that is configured to enable the endoscopic body portion 110 and the tool assembly 108 to engage and articulate in relation to one another. The interface connection structure 114 of interface connection 130 is configured and disposed on an inclined or angled surface 112 at distal end 110 b of the endoscopic body portion 110. Since the endoscopic body portion 110 is illustrated as having a circular cross-section, the inclined surface 112 defines an ellipse having a major axis X2′-X2′. Angle α1 is the angle between major axis X2′-X2′ and the longitudinal centerline axis X1-X2 of the endoscopic body portion 110 and also represents the angle of the inclined surface 112 with respect to the longitudinal centerline axis X1-X2.

Similarly, since the proximal end 160 a of the tool assembly 108 also has a circular cross-section, the interface connection 130 includes an inclined or angled surface 162 on the proximal end 160 a of the tool assembly 108. Inclined surface 162 also defines an ellipse having a major axis Y1′-Y1′ and angle α2 is the angle between major axis Y1′-Y1′ and the longitudinal centerline axis Y1-Y2 of the tool assembly 108 and also represents the angle of the inclined surface 162 with respect to the longitudinal centerline axis Y1-Y2.

An aperture 164 is defined in the inclined surface 162 which receives the interface connection structure 114 when the interface connection 130 is established. The interface structure 114 includes a circumferential groove 116 which engages a perimeter 166 of the aperture 164 and enables rotation of the tool assembly 108 around center X of aperture 118 that is defined by the interface connection structure 114 and is assumed to coincide with longitudinal centerline axis X1-X2.

Major axis X2′-X2′ coincides or aligns with major axis Y1′-Y1′ when angle θ1 and angle θ2 equal zero as shown in FIG. 1 and when angle θ1 and angle θ2 equal 90 degrees as shown in FIG. 3 .

FIG. 5 is a cross sectional view of interface connection 130 between the endoscopic body portion 110 and the tool assembly 108 when the angle θ1 and angle θ2 equal zero, which is also when the longitudinal centerline axis X1-X2 of the endoscopic body portion 110 and the longitudinal centerline axis Y1-Y2 of the tool assembly 108 are aligned and overlapping. In addition, the major axis X2′-X2′ of the endoscopic body portion 110 and the major axis Y1′-Y1′ of the tool assembly 108—are also aligned. The apertures 118 and 164 are illustrated in cross-sectional view.

FIG. 6 is a cross sectional view of the endoscopic body portion 110 and the tool assembly 108 at a 90 degree angle (θ1=θ2=90 degrees and also α3=α1+α2=90 degrees) with respect to one another as shown in FIG. 4 and illustrating operating mechanism drive member 128 within an interior volume of space 110′ of endoscopic body portion 110. The drive member 128 enables rotation of the tool assembly 108—around the interface connection 130 with respect to the endoscopic body portion 110.

The connection 132 between the operating mechanism drive member 128 and the clamp member 168 for the tool assembly 108 as exemplified by the tool assembly 108 illustrates that rotation of the operating mechanism drive member 128 causes rotation of the clamp member 168. Since the clamp member 168 is non-rotatably positioned within the tool assembly 108, rotation of the clamp member 168 causes rotation of the tool assembly 108 around the interface connection 130. The operating mechanism drive member 128 is composed of bendable material that is rigidly connected to the clamp member 168 in an interior portion 160′ of the tool assembly 108. As such, when the drive member 128 is moved longitudinally in relation to the tool assembly 108 with the tool assembly 108 articulated in relation to the endoscopic body portion 110, the drive member 128 will bend about the axis of articulation X1-X2 such that angles θ1 and θ2 vary initially from zero to 90°. When θ1 and θ2 are 90°, the major axis X2′-X2′ of the endoscopic body portion 110 and the major axis Y1′-Y1′ of the tool assembly 108—are also aligned as shown in FIG. 6 .

In an aspect of the disclosure, not shown, surfaces 112 and 162 may be inclined at angles such that the third angle α3, which is equal to the sum of the first angle α1 and the second angle α2, is less than 90 degrees, thereby enabling articulation of the tool assembly 108 over arc segments greater than 90 degrees. The portion of operating mechanism drive member 128 coinciding with axis Y1-Y2 would also be further inclined with respect to the portion of operating mechanism drive member 128 coinciding with axis X1-X2 to conform to the shape formed by the now acute angle α3.

For example, instead of being 45 degrees each, α1 and α2 may each be equal to 30 degrees so that α3 now equals 60 degrees. Therefore, when the surfaces 112 and 162 are aligned as shown in FIG. 6 , the angles θ1=θ2 now equal 180 degrees minus α3 or 120 degrees.

For other surgical instruments such as forceps, graspers, retractors, clip appliers, ligation devices, or the like, such devices also include endoscopic body portions and tool assemblies that are configured to provide the specific surgical function of the instrument. In such devices, the drive member 128 may have a distal end coupled to the tool assembly in a manner to facilitate rotation of the tool assembly in relation to the endoscopic body portion 110 since such a device may not include a clamp member such as described above.

In addition, it should be noted that while the endoscopic body portion 110 is illustrated in FIGS. 1-6 as having a constant cross-sectional diameter from proximal end 110 a to the interface connection 130 at distal end 110 b, the endoscopic body portion 110 may be configured with a convex or concave flaring arrangement wherein the cross-sectional diameter varies along the longitudinal centerline axis X1-X2 and in the vicinity of the interface connection 130. The proximal end 160 a of the tool assembly 108 may also be configured in a similar manner in the vicinity of the interface connection 130.

In view of the foregoing description, referring to FIGS. 1-6 , those skilled in the art will recognize and understand that surgical instrument 100 includes endoscopic body portion 110 defining first longitudinal axis X1-X2 and having proximal end portion 110 a and distal end portion 110 b and tool assembly 108 defining second longitudinal axis Y1-Y2 and having proximal end portion 160 a, and distal end portion 160 b. The tool assembly 108 is coupled to the endoscopic body portion 110 at interface connection 130. The interface connection 130 includes a first angled surface, represented by inclined or angled surface 112 at distal end 110 b of the endoscopic body portion 110, and a second angled surface, represented by inclined or angled surface 162 at proximal end 160 a of tool assembly 108. The first and second angled surfaces 110 b and 160 a, respectively, are positioned in abutting relation.

The operating mechanism 120 is configured to transition the tool assembly 108 from a first position in which the first and second axes X1-X2 and Y1-Y2, respectively, are aligned, as shown in FIG. 1 and FIG. 5 , to second articulated positions in which the first and second axes X1-X2 and Y1-Y2, respectively, are misaligned, as shown in FIGS. 2, 3, 4, and 6 . Referring most particularly to FIGS. 2 and 6 , the operating mechanism 120 includes drive member 128 that extends through the endoscopic body portion 110 and is coupled to the tool assembly 108 such that rotation of the drive member 128 causes rotation of the tool assembly 108 in relation to the endoscopic body portion 110 to transition the tool assembly 108 from the first position to the second articulated positions.

The tool assembly 108 includes clamp member 168 and the drive member 128 is formed from a resilient material that is rigidly connected to the clamp member 168 within the tool assembly 108 such that actuation of the operating mechanism, or operating mechanism drive member 128, causes the clamp member 168 to rotate the tool assembly 108 around the interface connection 130 of the endoscopic body portion 110.

Referring most particularly to FIG. 2 , in an aspect, the operating mechanism 120 includes rack and pinion gear assembly 122 that is in operable communication with the drive member 128. The rack and pinion gear assembly 122 includes rack 124 and pinion gear 126 engaged with the rack 124. The pinion gear 126 is coupled to the drive member 128, wherein linear motion of the rack 124 effects rotational movement of the pinion gear 126 to effect corresponding rotation of the drive member 128.

In an aspect, pinion gear 126 of the rack and pinion gear assembly 122 defines aperture 1260. The drive member 128 is longitudinally movable through the aperture 1260 to facilitate longitudinal movement of the clamp member 168 in relation to the tool assembly 108.

In an aspect, the first inclined or angled surface 112 defines the first angle α1 at the distal end portion 110 b of the endoscopic body portion 110 while the second inclined or angled surface 162 defines the second angle α2 at the proximal end portion 160 a of the tool assembly 108, and the sum of the first angle α1 and the second angle α2 forms third angle α3 that is greater than or equal to 90 degrees.

In an aspect, the first inclined or angled surface 112 defines the first angle α1 at the distal end portion 110 b of the endoscopic body portion 110 while the second inclined or angled surface 162 defines the second angle α2 at the proximal end portion 160 a of the tool assembly 108, and the sum of the first angle α1 and the second angle α2 forms third angle α3 that is less than 90 degrees.

In an aspect of the disclosure, the tool assembly 108 includes anvil and cartridge assembly 160. The anvil and cartridge assembly 160 includes cartridge assembly 1601 and anvil 1602. The anvil and cartridge assembly 160 is pivotably movable to effect the transitioning of the tool assembly 108 from the first position in which the first and second axes X1-X2 and Y1-Y2, respectively, are aligned, as shown in FIG. 1 and FIG. 5 , to the second articulated positions in which the first and second axes X1-X2 and Y1-Y2, respectively, are misaligned, as shown in FIGS. 2, 3, 4, and 6 .

In one aspect of the disclosure, surgical instrument 100 includes cartridge assembly 1601 and anvil 1602. The cartridge assembly 1601 is pivotably movable in relation to the anvil 1602 between spaced and approximated positions.

The surgical instrument 100 includes endoscopic body portion 110 and anvil and cartridge assembly 160 wherein the endoscopic body portion 110 and the anvil and cartridge assembly 160 each define respective first and second longitudinal centerline axes X1-X2 and Y1-Y2, respectively, and include proximal end portions 110 a and 160 a and distal end portions 110 b and 160 b, respectively. The anvil and cartridge assembly 160 is coupled to the endoscopic body portion 110 at interface connection 130. The interface connection 130 includes first inclined or angled surface 112 formed on the distal end portion 110 b of the endoscopic body portion 110 and second inclined or angled surface 162 formed on the proximal end portion 160 a of the anvil and cartridge assembly 160. The first and second angled surfaces 112 and 162 are positioned in abutting relation.

The operating mechanism 120 is configured to transition the anvil and cartridge assembly 160 from the first position in which the first and second axes X1-X2 and Y1-Y2, respectively, are aligned, as shown in FIG. 1 and FIG. 5 , to the second articulated positions in which the first and second axes X1-X2 and Y1-Y2, respectively, are misaligned, as shown in FIGS. 2, 3, 4, and 6 .

The operating mechanism 120 includes drive member 128 that extends through the endoscopic body portion 110 and is coupled to the anvil and cartridge assembly 160 such that rotation of the drive member 128 causes rotation of the anvil and cartridge assembly 160 in relation to the endoscopic body portion 110 to transition the anvil and cartridge assembly 160 from the first position to the second articulated positions, as indicated above.

In an aspect, the surgical instrument 100 also includes clamp member 168, as shown in FIG. 6 , and the drive member 128 is again formed from a resilient material that is rigidly connected to the clamp member 168 within the anvil and cartridge assembly 160 such that actuation of the operating mechanism 120 causes the clamp member 168 to rotate the anvil and cartridge assembly 160 around the interface connection 130 of the endoscopic body portion 110.

In an aspect, the operating mechanism 120 also includes rack and pinion gear assembly 122 that is in operable communication with the drive member 128. The rack and pinion gear assembly 122 includes rack 124 and pinion gear 126 engaged with the rack 124. The pinion gear 126 is coupled to the drive member 128, wherein linear motion of the rack 124 effects rotational movement of the pinion gear 126 to effect corresponding rotation of the drive member 128.

In an aspect, pinion gear 126 of the rack and pinion gear assembly 122 also defines aperture 1260. The drive member 128 is longitudinally movable through the aperture 1260 to facilitate longitudinal movement of the clamp member 168 in relation to the tool assembly 108.

In an aspect, the first inclined or angled surface 112 also defines the first angle α1 at the distal end portion 110 b of the endoscopic body portion 110 while the second inclined or angled surface 162 defines the second angle α2 at the proximal end portion 160 a of the tool assembly 108, and the sum of the first angle α1 and the second angle α2 forms third angle α3 that is greater than or equal to 90 degrees.

In another aspect, the first inclined or angled surface 112 also defines the first angle α1 at the distal end portion 110 b of the endoscopic body portion 110 while the second inclined or angled surface 162 defines the second angle α2 at the proximal end portion 160 a of the tool assembly 108, and the sum of the first angle α1 and the second angle α2 forms third angle α3 that is less than 90 degrees.

While several aspects of the disclosure have been shown in the drawings, it is not intended that the disclosure be limited thereto, as it is intended that the disclosure be as broad in scope as the art will allow and that the specification be read likewise. Therefore, the above description should not be construed as limiting, but merely as examples of particular aspects of the disclosure. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.

Although the foregoing disclosure has been described in some detail by way of illustration and example, for purposes of clarity or understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the appended claims. 

What is claimed is:
 1. A surgical instrument comprising: an endoscopic body portion defining a first longitudinal axis and having a proximal end portion and a distal end portion, a tool assembly defining a second longitudinal axis and having a proximal end portion and a distal end portion, the tool assembly coupled to the endoscopic body portion at an interface connection and including a clamp member, the interface connection including a first angled surface formed on the distal end portion of the endoscopic body portion and a second angled surface formed on the proximal end portion of the tool assembly, the first and second angled surfaces positioned in abutting relation; and an operating mechanism configured to transition the tool assembly from a first position in which the first longitudinal axis defined by the endoscopic body portion and the second longitudinal axis defined by the tool assembly are aligned to second articulated positions in which the first longitudinal axis defined by the endoscopic body portion and the second longitudinal axis defined by the tool assembly are misaligned, the operating mechanism including a drive member that extends through the endoscopic body portion and is coupled to the clamp member of the tool assembly such that rotation of the drive member causes rotation of the tool assembly in relation to the endoscopic body portion to transition the tool assembly from the first position to the second articulated positions, the drive member advanceable and retractable within the endoscopic body portion to enable longitudinal movement of the clamp member along the tool assembly.
 2. The surgical instrument according to claim 1, wherein the drive member is composed from a resilient material that is rigidly connected to the clamp member within the tool assembly, and wherein actuation of the operating mechanism causes the clamp member to rotate so as to concurrently rotate the tool assembly around the interface connection of the endoscopic body portion to enable the transitioning of the tool assembly from the first position to the second articulated positions.
 3. The surgical instrument according to claim 2, wherein the operating mechanism includes a rack and pinion gear assembly in operable communication with the drive member, the rack and pinion gear assembly including a rack and a pinion gear engaged with the rack, the pinion gear coupled to the drive member, wherein linear motion of the rack effects rotational movement of the pinion gear to effect corresponding rotation of the drive member.
 4. The surgical instrument according to claim 3, wherein the pinion gear of the rack and pinion gear assembly defines an aperture, the drive member being longitudinally movable through the aperture to facilitate longitudinal movement of the clamp member in relation to the tool assembly.
 5. The surgical instrument according to claim 1, wherein the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, wherein the second angled surface defines a second angle at the proximal end portion of the tool assembly, and wherein the sum of the first angle and the second angle forms a third angle that is greater than or equal to 90 degrees.
 6. The surgical instrument according to claim 2, wherein the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, wherein the second angled surface defines a second angle at the proximal end portion of the tool assembly, and wherein the sum of the first angle and the second angle forms a third angle that is less than 90 degrees.
 7. The surgical instrument according to claim 1, wherein the tool assembly includes an anvil and a cartridge assembly.
 8. A surgical instrument comprising: an endoscopic body portion defining a first longitudinal axis, a cartridge assembly; and an anvil; the cartridge assembly and the anvil being pivotably movable with respect to one another; the anvil and the cartridge assembly and the endoscopic body portion each including proximal and distal ends, the anvil and cartridge assembly defining a second longitudinal axis and having a proximal end portion and a distal end portion, the tool assembly coupled to the endoscopic body portion at an interface connection, the interface connection including a first angled surface formed on the distal end portion of the endoscopic body portion and a second angled surface formed on the proximal end portion of the anvil and cartridge assembly, the first and second angled surfaces positioned in abutting relation; a clamp member engaged with the anvil and the cartridge assembly; and an operating mechanism configured to transition the anvil and cartridge assembly from a first position in which the first longitudinal axis defined by the endoscopic body portion and the second longitudinal axis defined by the anvil and cartridge assembly are aligned to second articulated positions in which the first longitudinal axis defined by the endoscopic body portion and the second longitudinal axis defined by the anvil and cartridge assembly are misaligned, the operating mechanism including a drive member that extends through the endoscopic body portion and is coupled to the anvil and cartridge assembly such that rotation of the drive member causes rotation of the anvil and cartridge assembly in relation to the endoscopic body portion to transition the anvil and cartridge assembly from the first position to the second articulated positions, the drive member advanceable and retractable within the endoscopic body portion to enable longitudinal movement of the clamp member in relation to the anvil and the cartridge assembly.
 9. The surgical instrument according to claim 8, wherein the drive member is composed from a resilient material that is rigidly connected to the clamp member within the anvil and the cartridge assembly, and wherein actuation of the operating mechanism causes the clamp member to rotate so as to concurrently rotate the anvil and cartridge assembly around the interface connection of the endoscopic body portion to enable the transitioning of the anvil and cartridge assembly from the first position to the second articulated positions.
 10. The surgical instrument according to claim 8, wherein the operating mechanism includes a rack and pinion gear assembly in operable communication with the drive member, the rack and pinion gear assembly including a rack and a pinion gear engaged with the rack, the pinion gear coupled to the drive member, wherein linear motion of the rack effects rotational movement of the pinion gear to effect corresponding rotation of the drive member.
 11. The surgical instrument according to claim 10, wherein the pinion gear of the rack and pinion gear assembly defines an aperture, the drive member being longitudinally movable through the aperture to facilitate longitudinal movement of the clamp member in relation to the anvil and cartridge assembly.
 12. The surgical instrument according to claim 8, wherein the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, wherein the second angled surface defines a second angle at the proximal end portion of the anvil and cartridge assembly, and wherein the sum of the first angle and the second angle forms a third angle that is greater than or equal to 90 degrees.
 13. The surgical instrument according to claim 8, wherein the first angled surface defines a first angle at the distal end portion of the endoscopic body portion, wherein the second angled surface defines a second angle at the proximal end portion of the anvil and cartridge assembly, and wherein the sum of the first angle and the second angle forms a third angle that is less than 90 degrees. 